Changed the plugs on the truck this weekend to the updated plug from Ford Motorcraft (SP507) and what a difference it made. All the problems have went away....no longer do I have the spitting and sputtering from take-off or the same thing whenever I hammer down at 40-60mph. One thing I learned from the mechanic that saved us by letting us use the $300 extracting tool because out of 8 we did have 1 break off in the head.....if you don't have the tool then I do not recommend doing the plug change yourself....anyways what I learned from the mechanic was the code I was getting said that #1 misfire was really #1.....these machines at your local autoparts store are not as advanced as the ones mechanics have. Acutally the misfire is coming from #2 instead of #1. The mechanic said he has had numerous fords come through his shop and the fix has been just changing the #2 spark plug. I'm not saying its not worth changing all the plugs because in my cause I had a little over 55k so I was due for a tune-up....but with the price my dealership was quoting ($742) to change the plugs....some people might be able to get away with changing the #2 plug and it fixing the problem. Well hope this lil bit of info will help others out. Thanks again to all the people on here for your help with mine.....

 

My truck is going in for a CLY 1 misfire. It would misfire around 40MPH under light throttle and I watched the realtime graph on the tech's laptop...it was evident that CLY 1 would drop to the bottom of the graph when the truck hesitated. I am taking it in for a new COP and plug in CLY 1. I'm hoping it helps...

 

Well hopefully you have better luck than what I did....I too seen the same thing at the dealership and they told me that a new COP...boot...and plug would fix the problem but unfortunately it didn't and I still had to pay the deductible for that work....after that didn't fix the problem they said it was the throttle body....so they changed that out and the problem was still there...and of course I had to pay the deductible once again with the problem still evident.....so thats when I started researching and spoke with Ford techs and thats when I found out there was an updated plug that ford was recommending for the misfire at high RPMs.....I'm not saying that it couldn't be #1 causing the problem but I changed everything on #1 and the problem was still there.....if I would of found out about the #2 before we had already changed all the plugs I would of tried it out just to see if that statement was true.....let me know how things come out with yours....thanks

 

What were your symptoms?

 

Changing one at a time may TEMPORARILY fix the problam with plugs. All you are doing is waiting on the domino effect, and, feeding the beast we call dealers (stealers) retirement funds. If you have money to burn go for it. But, you will have more downtime down the road.

All of the plugs have the same amount of mileage, so, who is to say that they are not all bad? I change them all at one time. Call me weird, but, that has always been the way plugs were changed for tuneups.

 

I agree and completely understand, but I don't have the funds for a complete plug change right now. All of this work is being done under warranty...the remaining plugs will be changed when the tax funds come in. I am not taking the chance of breaking a plug in my driveway, it's not worth the gamble to me. I'd rather pay the 3-500, whatever it is and get it done at the dealer. If a plug breaks, they have the tool right there to fix it.

 

Your exactly right....a tune-up does consist of changing all the plugs...which is what I did because I was already to deep into changing the plugs so there was no reason to stop with just one plug......I only posted about changing the #2 plug for people who didn't have the money and possibly fixing the misfire problem until they could afford the $$ tune-up.

I was lucky because I knew the mechanic who had the extracting tool so that is why I got off so cheap....$101(plugs and new boots)...$50(guy who helped changed the plugs)...and $14(30-pack for the mechanic with the tool)
But if I would of know about the #2 maybe being the issue I would of replaced that plug to save me a lil time before I had to spend $700-$800 on the tune-up.

 

What did the service tech do to show the misfire? Any PCM code?

My symptoms are a little bit different than yours in such a way that if I were cruising @40 and went WOT, it would down shift fine and accelerate sometimes with very subtle little stumbles along the way, not every time though. I believe I nixed this problem with a new fuel filter as the little stumbles didn't happen last night on the test drive or this morning on the way to work.

But, If I were cruising at 40-50 and applied slight throttle to advance up an incline, the truck would hesitate and not go down a gear. This is when I had the tech in the truck with a laptop showing me when the stumble occurs, cylinder #1's measurement bounced off the chart and back to inline with the rest of the cylinders every time the stumble occurred. The remaining 7 cylinders stayed very much together except #1. It looked like #1 was shutting off...

 

Got the truck in on Friday, a new COP and plug later and problem is gone. Thanks, extended warranty...

 

yeah! u should got extended warranty on a f150